n.pl. colloq. 1 Brit. underpants or knickers. 2 US trousers or slacks. bore (or scare etc.) the pants off colloq. bore, scare, etc., to an intolerable degree. pants (or pant) suit esp. US a trouser suit. with one's pants down colloq. in an embarrassingly unprepared state.
[ abbr. of PANTALOONS ]